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The ISO Navigator™ database hyperlinks the ISO 9000 principles and the ISO 9001 requirements; and explains them in plain English with practical guidance.
ISO 9000: Supplier relationships
Your company and its suppliers are inter-dependent and mutually beneficial relationships help both parties create value. This is an interesting idea but is never fully developed beyond purchasing and data analysis. Taken to its logical conclusion this principle should lead you into Just In Time inventory management.